Question

Hydrolysis of ester in acid medium
is pseudo first order reaction
en CH3COOC2H5+H2O =K [CH3COOH+C2H5OH]
Expected Rate = K[ CH3COOC2H5] [H2O]
Actual Rate ak' [CH3COOC2H5]
K=2x10 molt seet
Calculato value of k'​

Answer 1

Explanation:

(i) The average rate of reaction between the time interval 30 to 60 is

60−30

0.31−0.17

=4.67×10

−3

M/s.

(ii) k=

t

2.303

log

[Ester]

[Ester]

0

When t = 30 s

k=

30

2.303

×log(

0.31

0.55

)=1.91×10

−2

/s

When t = 60 s

k=

60

2.303

×log(

0.17

0.55

)=1.96×10

−2

/s

When t = 90 s

k=

90

2.303

×log(

0.085

0.55

)=2.07×10

−2

/s

Average rate constant k=

3

k1+k2+k3

=1.98×10

−2

/s